Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e257eb2e2bcaa5c6af05876b7d85ed2152b55630184f8f524c9cf3d095c60894' 
  AND token = 'bYuJyXN3rN6emdLGfToSQUdj/EXL06prnqAAuZGMK9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}